Datasheet

AD9279
Rev. 0 | Page 42 of 44
Addr.
(Hex)
Register Name
Bit 7
(MSB)
Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Bit 0
(LSB)
Default
Value
Comments
0x1A USER_PATT1_MSB B15 B14 B13 B12 B11 B10 B9 B8 0x00 User-Defined
Pattern 1, MSB
(global).
0x1B USER_PATT2_LSB B7 B6 B5 B4 B3 B2 B1 B0 0x00 User-Defined
Pattern 2, LSB
(global).
0x1C USER_PATT2_MSB B15 B14 B13 B12 B11 B10 B9 B8 0x00 User-Defined
Pattern 2, MSB
(global).
0x21 SERIAL_CONTROL LSB first
1 = on
0 = off
(default)
X X X <10
MSPS,
low
encode
rate
mode
1 = on
0 = off
(default)
000 = 12 bits (default, normal
bit stream)
001 = 8 bits
010 = 10 bits
011 = 12 bits
100 = 14 bits
0x00 Serial stream
control (global).
0x22 SERIAL_CH_STAT X X X X X X Channel
output
reset
1 = on
0 = off
(default)
Channel
power-
down
1 = on
0 = off
(default)
0x00 Used to power
down individual
sections of a
converter (local).
0x2B FLEX_FILTER X Enable
automatic
low-pass
tuning
1 = on
(self-
clearing)
X X High-pass filter cutoff
0000 = f
LP
/12.00
0001 = f
LP
/8.57
0010 = f
LP
/6.67
0011 = f
LP
/5.46
0100 = f
LP
/4.62
0101 = f
LP
/4.00
0110 = f
LP
/3.53
0111 = f
LP
/3.16
0x00 Filter cutoff
(global).
(f
LP
= low-pass
filter cutoff
frequency.)
0x2C ANALOG_INPUT X X X X X X LO-x, LOSW-x
connection
00 = R
FB1
(default)
01 = R
FB1
||R
FB2
10 = R
FB2
11 = ∞
0x00 LNA active
termination/input
impedance
(global).
0x2D CW Doppler
I/Q demodulator
phase
X X X CW
Doppler
channel
enable
1 = on
0 = off
I/Q demodulator phase
0000 = 0°
0001 = 22.5°
0010 = 45°
0011 = 67.5°
0100 = 90°
0101 = 112.5°
0110 = 135°
0111 = 157.5°
1000 = 180°
1001 = 202.5°
1010 = 225°
1011 = 247.5°
1100 = 270°
1101 = 292.5°
1110 = 315°
1111 = 337.5°
0x00 Phase of
demodulators
(local).